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    • com.opencredo.concursus.domain.commands.dispatching.DispatchingCommandProcessor Maven / Gradle / Ivy

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    package com.opencredo.concursus.domain.commands.dispatching;

import com.opencredo.concursus.domain.commands.Command;
import com.opencredo.concursus.domain.commands.CommandType;

import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * A {@link CommandProcessor} that dispatches commands to {@link CommandProcessor}s by {@link CommandType}.
 */
public final class DispatchingCommandProcessor implements CommandProcessor, CommandSubscribable {

    /**
     * Create a {@link DispatchingCommandProcessor} with no {@link CommandProcessor}s registered to handle commands.
     * @return The constructed {@link DispatchingCommandProcessor}
     */
    public static DispatchingCommandProcessor create() {
        return new DispatchingCommandProcessor(new ConcurrentHashMap<>());
    }

    private final ConcurrentMap processorRegistry;

    private DispatchingCommandProcessor(ConcurrentMap processorRegistry) {
        this.processorRegistry = processorRegistry;
    }

    @Override
    public Optional process(Command command) throws Exception {
        final CommandType commandType = command.getCommandType();
        CommandProcessor processor = processorRegistry.get(commandType);
        checkNotNull(processor,
                "No command processor registered for command type %s", commandType);

        return processor.process(command);
    }

    @Override
    public CommandSubscribable subscribe(CommandType commandType, CommandProcessor commandProcessor) {
        processorRegistry.put(commandType, commandProcessor);
        return this;
    }
}
    
    
    
    

    




    
    
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